Not sure if I get u right .. I just didn't want to reinvent the weehl for my use case, let's have a more concrete example of what I want to do, upload a presentation (.mp4) and link the slides (.PDF)s to it. I get ur point about the protocol and app part, thought maybe there is already something done for the same thing that I'm proposing ..
I'd probably introduce a new event kind to preserve that relationship between one or more file types (blobs)
What do u think ?